IEEE Power & Energy Magazine - May/June 2018 - 95

figure 17. A 138-kV three-phase oil breaker mounted on a skid base. (From Westinghouse Descriptive Bulletin 33-252, Sept. 1977.)

desire to reduce the volume of oil
required. this resulted in special tank designs to conform
to the voltage gradients around
the internal high-voltage components. One such design is shown
in Figure 18 as an example of
the progress made in reducing the
quantity of oil. the live tank type
of breaker (Figure 19) was a
conservative design in oil quantity; however, this type of breaker
did not provide the magnitude of
interrupting currents desired and
did not become a major design
for the U.S. market as noted
previously. the OCBs reached
their highest voltage of 345 kV
(Figure 20), originally designed
for 40-ka interrupting duty and
subsequently modified to meet
63 ka, with internal shields to

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Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2018

Contents
IEEE Power & Energy Magazine - May/June 2018 - Cover1
IEEE Power & Energy Magazine - May/June 2018 - Cover2
IEEE Power & Energy Magazine - May/June 2018 - Contents
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IEEE Power & Energy Magazine - May/June 2018 - Cover3
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